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이치범(Chibum Lee) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
This study presents a novel dynamic mode Atomic Force Microscope (AFM) where the deflection signal is directly used for force regulation instead of its amplitude or phase. Cantilever mock system without the interaction with cantilever is composed and included in the control algorithm. The control synthesis problem is posed in a robust optimal control and multi-objective LMI framework. A method to estimate the interaction force and extract the sample topography from it is also presented. This method can be efficient in high speed AFMs where the scanning bandwidths are more than 10% of the natural frequency of the cantilevers, therefore make possible to high speed imaging without compromising on the bandwidth and resolution.
이동통신 단말기 카메라의 손떨림 보정 장치의 H<SUB>∞</SUB> 제어
이치범(Chibum Lee) 한국생산제조학회 2014 한국생산제조학회지 Vol.23 No.3
This study proposes a closed-loop shaping control method with H<SUB>∞</SUB> optimization for optical image stabilization (OIS) in mobile phone cameras. The image stabilizer is composed of a horizontal stage constrained by ball bearings and actuated by the magnetic force from voice coil motors. The displacement of the stage is measured by Hall effect sensors. From the OIS frequency response experiment, the transfer function models of the stage and Hall effect sensor were identified. The weight functions were determined considering the tracking performance, noise attenuation, and stability with considerable margins. The H∞ optimal controller was executed using closed-loop shaping and limiting the controller order, which should be less than 6 for real-time implementation. The control algorithm was verified experimentally and proved to operate as designed.
이치범(Chibum Lee),최승렬(Seungryul Choi),김영준(Youngjoon Kim) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.5_2
The objective of this study is to analyze steering feel performance of vehicle considering hydraulic characteristics of steering system. Through detail modeling of each hydraulic system, it is possible to simulate steering torque precisely. Thus, steering feel performance can be evaluated and the accuracy of simulation can be improved.
이치범(Chibum Lee),박희재(Hee Jae Park) 한국생산제조학회 2015 한국생산제조학회지 Vol.24 No.6
Owing to miniaturization and low-power electronics, mobile, implanted, and wearable devices have become the main trends of electronics during the past decade. There has been much research regarding energy harvesting to achieve battery-free or self-powered devices. The optimal design problems of a double-pendulum kinetic-energy harvester from human motion are studied in this paper. For the given form factor, the weight of the harvester, and the known human excitation, the optimal design problem is solved using a dynamic non-linear double-pendulum model and an electric generator. The average electrical power was selected as the performance index for the given time period. A double-pendulum harvester was proven to be more efficient than a single-pendulum harvester when the appropriate parameters were used.
유한요소 해석을 통한 레이디얼 빔 커플링의 설계인자 분석
이치범(Chibum Lee),박영일(Yeong Il Park) Korean Society for Precision Engineering 2013 한국정밀공학회지 Vol.30 No.5
In this paper, a novel radial beam coupling model was proposed and the design parameters were studied for the efficient transmission of torque. To develop a high performance radial beam coupling, an analytical way to predict the performance in design phase is required. One of the best ways to estimate the performance of the coupling without manufacturing is to evaluate the stress and torsional stiffness by building a finite element model with a special attention to the radial beam cutting part. For the best results of FEA, the material properties were obtained through testing. To verify the reliability of finite element model, the results of FEA were compared with the experiments. The main design parameters of radial beam cutting width, radial beam cutting depth, and radial beam cutting direction were considered for the performance of radial beam coupling.